! service instance 1110 ethernet encapsulation dot1q 421 rewrite ingress tag pop 1 symmetric service-policy output samsung-downlink-10M <---obviously, a locally-configured sp is refercned on this line... bridge-domain 421
This configuration was taken off a 7600 router that is playing the role of backhaul aggregator in a mobile broadband environment.
I tried searching for an explanation of service instances, but it seems that the only thing I can find is how to configure one - not what it is or when you would deploy one.
Seriously, i am still digesting it myself but a service can be many things and the EVC framework allows you to apply mutiple services to the same physical port. An example of a service would be a dot1q trunk, a Q-in-Q tunnel etc.
From the Command lookup tool from the previous post if you select IOS -> then select all IOS Commands and Paste "service instance" in the next field, it will give you a few links. I copied a bit to give you some idea. There are more if you click on the link. Probably you already did this, thought I should mention it anyway.
A service instance is a configuration object (container) that holds all management and control-plane attributes and parameters that apply to that service instance on a per-port basis. Different service instances that correspond to the same EVC must share the same name. Service instances are associated with a global EVC object through their shared name.
After you enter the service instance ethernetcommand, the device enters Ethernet service configuration mode, and these configuration commands are available:
•default—Sets the service instance to its default state.
A service instance is simply a way to apply one of the above services to a specific port on the 7600.
Your config example -
service instance 1110 ethernet <--- simply the identifier and type of service ie. it's an ethernet service with id of 1110
encapsulation dot1q 421 <--- this means match any frame that has a vlan tag of 421
rewrite ingress tag pop 1 symmetric <--- this means when a packet is received on the port strip the outer vlan tag of 421 which is the outermost tag. Also, because of the symmteric keyword it means add the vlan tag of 421 for any frame leaving the port.
service-policy output samsung-downlink-10M <---obviously, a locally-configured sp is refercned on this line...
bridge-domain 421 <-- this bit is still a bit hazy. From the config do you have any other ports that have been configured with this bridge-domain id of 421 ? If so could you post their config as well.
Basically a bridge-domain is used to emulate what we think of a classic L2 broadcast domain where mac-addresses are used for forwarding decisions.
Where your example is a bit confusing to me is that the bridge-domain is using a vlan ID of 421 which is the vlan ID you are matching and removing with the other commands in the config. From all the examples in the link it seems the bridge-domain vlan ID is different from the vlan ID you are matching and removing/adding.
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